
public class Kreis extends Geofigur
{
	double r;
	
	public Kreis(double radius)
	{
		r = radius;
	}
	
	public double getFlaeche()
	{
		return Math.PI* r *r;
	}
	
	public double getUmfang()
	{
		return 2 * Math.PI * r;
	}
	
}
